ALL forms of acids react DANGEROUSLY with all forms of chlorine or bromine. Never, never, NEVER mix
swimming pool chemicals of any type! Chlorine compounds that look or smell alike may not be the same: you have to know
the actual chemical. Allowing even small amounts of different chlorine sanitizers to touch each other can be REALLY
dangerous. In particular, trichlor and calcium hypochlorite can react dangerously on contact with each other. Once they're
dissolved in the pool, though, they get along fine.